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id="toggle-menu"><a class="site-page"><i class="fas fa-bars fa-fw"></i></a></div></div></nav><div id="post-info"><h1 class="post-title">JS防抖与节流（类比游戏技能）</h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2022-08-26T08:00:00.000Z" title="发表于 2022-08-26 08:00:00">2022-08-26</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2023-05-04T17:24:22.255Z" title="更新于 2023-05-04 17:24:22">2023-05-04</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/JavaScript/">JavaScript</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span data-flag-title="JS防抖与节流（类比游戏技能）"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="twikoo_visitors"><i class="fa-solid fa-spinner fa-spin"></i></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h2 id="JS防抖与节流（类比游戏技能）"><a href="#JS防抖与节流（类比游戏技能）" class="headerlink" title="JS防抖与节流（类比游戏技能）"></a>JS防抖与节流（类比游戏技能）</h2><blockquote><p><a target="_blank" rel="noopener" href="https://juejin.cn/column/6964717704712290317">点击获取资料–2021最新前端面试题汇总</a></p></blockquote><h3 id="防抖"><a href="#防抖" class="headerlink" title="防抖"></a>防抖</h3><h3 id="生活中防抖的例子"><a href="#生活中防抖的例子" class="headerlink" title="生活中防抖的例子"></a>生活中防抖的例子</h3><ul><li>酒店的自动开关门<ul><li>感应到人自动开门，5s后自动关闭</li><li>如果5s的倒计时里有人来，那么这个5s重新开始计时</li></ul></li></ul><h3 id="类比技能吟唱"><a href="#类比技能吟唱" class="headerlink" title="类比技能吟唱"></a>类比技能吟唱</h3><ul><li>知道释放一个法术(魔法)是需要吟唱时间的<ul><li>比如死歌的R</li><li>比如波比的R</li></ul></li><li>假设的技能没有CD<ul><li>那么在技能还没有吟唱完的时候再一次使用技能会打断第一次施法，重新开始施法</li><li>在上次技能没释放的时候释放下一次技能，第一次施法被打断是很好理解的吧</li><li>重新施法，重新开始吟唱也是很好理解的吧</li></ul></li></ul><h3 id="js中的防抖"><a href="#js中的防抖" class="headerlink" title="js中的防抖"></a>js中的防抖</h3><ul><li>如键盘输入等</li></ul><p>就和上面两个例子中提到的一样。<br>主要是用到了三点</p><ul><li>addEventListener</li><li>setTimeout</li><li>clearTimeout</li></ul><p>基础的html代码如下</p><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">const</span> button = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;#input&#x27;</span>)</span><br><span class="line"><span class="keyword">function</span> <span class="title function_">input</span> () &#123;</span><br><span class="line"><span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">&#x27;input!&#x27;</span>);</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">function</span> <span class="title function_">debounce</span> (fn,delay) &#123;</span><br><span class="line"><span class="comment">// Todo: 完成防抖</span></span><br><span class="line">&#125;</span><br><span class="line">button.<span class="title function_">addEventListener</span>(<span class="string">&#x27;click&#x27;</span>, <span class="title function_">debounce</span>(input,<span class="number">1000</span>))</span><br></pre></td></tr></table></figure><ul><li>因为防抖需要知道延时时间和完成的事件，所以防抖有两个参数</li></ul><h4 id="1-使用高阶函数，避免添加响应的时候触发函数"><a href="#1-使用高阶函数，避免添加响应的时候触发函数" class="headerlink" title="1.使用高阶函数，避免添加响应的时候触发函数"></a>1.使用高阶函数，避免添加响应的时候触发函数</h4><ul><li>一步一步来，如果没有使用高阶函数而是直接调用函数，如下图，会在添加响应的时候触发fn()</li></ul><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">function</span> <span class="title function_">debounce</span> (fn,delay) &#123;</span><br><span class="line">  <span class="title function_">fn</span>()</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure><p>所以先改为高阶函数解决这个bug</p><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">function</span> <span class="title function_">debounce</span> (fn,delay) &#123;</span><br><span class="line">  <span class="keyword">return</span> <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="title function_">fn</span>()</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure><h4 id="2-使用setTimeout完成延时执行-clearTimeout来控制刷新延时"><a href="#2-使用setTimeout完成延时执行-clearTimeout来控制刷新延时" class="headerlink" title="2.使用setTimeout完成延时执行,clearTimeout来控制刷新延时"></a>2.使用setTimeout完成延时执行,clearTimeout来控制刷新延时</h4><h5 id="2-1-为什么要把timer定义在函数外面？"><a href="#2-1-为什么要把timer定义在函数外面？" class="headerlink" title="2.1 为什么要把timer定义在函数外面？"></a>2.1 为什么要把timer定义在函数外面？</h5><p>为了形成闭包，这样在函数内部才能保证clearTimeout掉timer</p><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">function</span> <span class="title function_">debounce</span> (fn, delay) &#123;</span><br><span class="line">  <span class="keyword">let</span> timer</span><br><span class="line">  <span class="keyword">return</span> <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="built_in">clearTimeout</span>(timer)</span><br><span class="line">    timer = <span class="built_in">setTimeout</span>(<span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">      <span class="title function_">fn</span>()</span><br><span class="line">    &#125;, delay)</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure><h4 id="3-并不是万事大吉，注意this指针的改变"><a href="#3-并不是万事大吉，注意this指针的改变" class="headerlink" title="3.并不是万事大吉，注意this指针的改变"></a>3.并不是万事大吉，注意this指针的改变</h4><p>在函数里面log一下this指针</p><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">const</span> button = <span class="variable language_">document</span>.<span class="title function_">querySelector</span>(<span class="string">&#x27;#input&#x27;</span>)</span><br><span class="line"><span class="keyword">function</span> <span class="title function_">input</span> () &#123;</span><br><span class="line">  <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="string">&#x27;input!&#x27;</span>);</span><br><span class="line">  <span class="variable language_">console</span>.<span class="title function_">log</span>(<span class="variable language_">this</span>);</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">function</span> <span class="title function_">debounce</span> (fn, delay) &#123;</span><br><span class="line">  <span class="keyword">let</span> timer</span><br><span class="line">  <span class="keyword">return</span> <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="built_in">clearTimeout</span>(timer)</span><br><span class="line">    timer = <span class="built_in">setTimeout</span>(<span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">      <span class="title function_">fn</span>()</span><br><span class="line">    &#125;, delay)</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br><span class="line">button.<span class="title function_">addEventListener</span>(<span class="string">&#x27;click&#x27;</span>, <span class="title function_">debounce</span>(input, <span class="number">300</span>))</span><br></pre></td></tr></table></figure><p>结果函数内部的this指针变成了window，这是肯定不行的</p><h5 id="3-1-用context保存this指针-args保存添加的参数-用apply来改变this指针的指向"><a href="#3-1-用context保存this指针-args保存添加的参数-用apply来改变this指针的指向" class="headerlink" title="3.1 用context保存this指针,args保存添加的参数,用apply来改变this指针的指向"></a>3.1 用context保存this指针,args保存添加的参数,用apply来改变this指针的指向</h5><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">function</span> <span class="title function_">debounce</span> (fn, delay) &#123;</span><br><span class="line">    <span class="keyword">let</span> timer</span><br><span class="line">    <span class="keyword">return</span> <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">        <span class="keyword">let</span> context = <span class="variable language_">this</span></span><br><span class="line">        <span class="keyword">let</span> args=<span class="variable language_">arguments</span></span><br><span class="line">        <span class="built_in">clearTimeout</span>(timer)</span><br><span class="line">        timer = <span class="built_in">setTimeout</span>(<span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">            fn.<span class="title function_">apply</span>(context,args)</span><br><span class="line">        &#125;, delay)</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure><p>成功得到input的this指针</p><h4 id="4-return的function不可以使用匿名函数"><a href="#4-return的function不可以使用匿名函数" class="headerlink" title="4.return的function不可以使用匿名函数"></a>4.return的function不可以使用匿名函数</h4><p>其实是可以用匿名函数来简化上面的代码的，但是只能简化<code>setTimeout</code>里面的函数</p><ul><li>需要拿到<code>function</code>里面的context上下文</li><li>因为匿名函数没有<code>this</code>指针，所以<code>return</code>的函数写成匿名函数会出错，代码如下</li></ul><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">function</span> <span class="title function_">debounce</span> (fn, delay) &#123;</span><br><span class="line">     <span class="keyword">let</span> timer</span><br><span class="line">     <span class="keyword">return</span> <span class="function">() =&gt;</span> &#123;</span><br><span class="line">       <span class="keyword">let</span> context = <span class="variable language_">this</span></span><br><span class="line">       <span class="keyword">let</span> args=<span class="variable language_">arguments</span></span><br><span class="line">       <span class="built_in">clearTimeout</span>(timer)</span><br><span class="line">       timer = <span class="built_in">setTimeout</span>(<span class="function">() =&gt;</span> &#123;</span><br><span class="line">         fn.<span class="title function_">apply</span>(context,args)</span><br><span class="line">       &#125;, delay)</span><br><span class="line">     &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure><p>这种写法，<code>this</code>指针会指向<code>window</code><br>最终代码</p><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">function</span> <span class="title function_">debounce</span> (fn, delay) &#123;</span><br><span class="line">   <span class="keyword">let</span> timer</span><br><span class="line">   <span class="keyword">return</span> <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">     <span class="keyword">let</span> context = <span class="variable language_">this</span></span><br><span class="line">     <span class="keyword">let</span> args = <span class="variable language_">arguments</span></span><br><span class="line">     <span class="built_in">clearTimeout</span>(timer)</span><br><span class="line">     timer = <span class="built_in">setTimeout</span>(<span class="function">() =&gt;</span> &#123;</span><br><span class="line">       fn.<span class="title function_">apply</span>(context, args)</span><br><span class="line">     &#125;, delay)</span><br><span class="line">   &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure><h2 id="节流"><a href="#节流" class="headerlink" title="节流"></a>节流</h2><h3 id="生活中节流的例子"><a href="#生活中节流的例子" class="headerlink" title="生活中节流的例子"></a>生活中节流的例子</h3><ul><li>鲸鱼到水面换气<ul><li>鲸鱼是哺乳动物，所以需要每隔一段时间到水面换气</li><li>不一直在水面，因为还需要下潜保持皮肤的水分，这就和节约资源类似</li><li>鲸鱼呷一口气，这口气能支撑1个小时，那鲸鱼就下潜了，1小时后再来换气</li><li>这就是节流</li></ul></li></ul><h3 id="类比平A僵直"><a href="#类比平A僵直" class="headerlink" title="类比平A僵直"></a>类比平A僵直</h3><p>打过王者荣耀的都知道吧，拆塔的时候疯狂按攻击键？这没多大用</p><p>你的攻击次数由你的攻击速度(攻击间隔时长)决定</p><p>就是在上一次攻击指令完成前，是没有办法进行下一次攻击指令的</p><p>平A的僵直就是节流</p><h3 id="js中的节流"><a href="#js中的节流" class="headerlink" title="js中的节流"></a>js中的节流</h3><ul><li>如滚动监听</li></ul><p>在上面防抖基础上，节流的介绍就不再那么啰嗦，直接开始编写节流的代码</p><h4 id="1-使用定时器的思想来完成"><a href="#1-使用定时器的思想来完成" class="headerlink" title="1.使用定时器的思想来完成"></a>1.使用定时器的思想来完成</h4><h5 id="1-1根据思路写出基础代码"><a href="#1-1根据思路写出基础代码" class="headerlink" title="1.1根据思路写出基础代码"></a>1.1根据思路写出基础代码</h5><ul><li>同样是高阶函数</li><li>同样要操作timer，timer闭包</li><li>如果上一次还没延时没结束，就啥也不做(判断timer是否存在即可)。完成节流任务</li></ul><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">function</span> <span class="title function_">throttle</span> (fn, delay) &#123;</span><br><span class="line">  <span class="keyword">let</span> timer</span><br><span class="line">  <span class="keyword">return</span> <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="keyword">if</span> (timer) <span class="keyword">return</span></span><br><span class="line">    timer = <span class="built_in">setTimeout</span>(<span class="function">() =&gt;</span> &#123;</span><br><span class="line">      <span class="title function_">fn</span>()</span><br><span class="line">      timer = <span class="literal">null</span></span><br><span class="line">    &#125;, delay)</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure><p>1.2关键点还是改变this的指向</p><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">function</span> <span class="title function_">throttle</span> (fn, delay) &#123;</span><br><span class="line">      <span class="keyword">let</span> timer</span><br><span class="line">      <span class="keyword">return</span> <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">        <span class="keyword">let</span> context = <span class="variable language_">this</span></span><br><span class="line">        <span class="keyword">let</span> args = <span class="variable language_">arguments</span></span><br><span class="line">        <span class="keyword">if</span> (timer) <span class="keyword">return</span></span><br><span class="line">        timer = <span class="built_in">setTimeout</span>(<span class="function">() =&gt;</span> &#123;</span><br><span class="line">          fn.<span class="title function_">apply</span>(context, args)</span><br><span class="line">          timer = <span class="literal">null</span></span><br><span class="line">        &#125;, delay)</span><br><span class="line">      &#125;</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure><h4 id="2-使用Date对象来实现"><a href="#2-使用Date对象来实现" class="headerlink" title="2.使用Date对象来实现"></a>2.使用Date对象来实现</h4><h5 id="2-1综合前面的问题，直接写出来"><a href="#2-1综合前面的问题，直接写出来" class="headerlink" title="2.1综合前面的问题，直接写出来"></a>2.1综合前面的问题，直接写出来</h5><ul><li>但是发现有一个问题，就是函数第一次会立即执行</li></ul><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">function</span> <span class="title function_">throttle</span> (fn, delay) &#123;</span><br><span class="line">  <span class="keyword">let</span> pre = <span class="number">0</span></span><br><span class="line">  <span class="keyword">return</span> <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="keyword">let</span> now = <span class="keyword">new</span> <span class="title class_">Date</span>()</span><br><span class="line">    <span class="keyword">let</span> context = <span class="variable language_">this</span></span><br><span class="line">    <span class="keyword">let</span> args = <span class="variable language_">arguments</span></span><br><span class="line">    <span class="keyword">if</span> (now - pre &gt; delay) &#123;</span><br><span class="line">      fn.<span class="title function_">apply</span>(context, args)</span><br><span class="line">      pre = now</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure><p>2.2可以第一次不立即执行吗？可以！</p><p>判断，如果!pre就是第一次，第一次先拿到当前时间就可以了</p><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">function</span> <span class="title function_">throttle</span> (fn, delay) &#123;</span><br><span class="line">  <span class="keyword">let</span> pre = <span class="number">0</span></span><br><span class="line">  <span class="keyword">return</span> <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="keyword">if</span> (!pre) pre = <span class="keyword">new</span> <span class="title class_">Date</span>()</span><br><span class="line">    <span class="keyword">let</span> now = <span class="keyword">new</span> <span class="title class_">Date</span>()</span><br><span class="line">    <span class="keyword">let</span> context = <span class="variable language_">this</span></span><br><span class="line">    <span class="keyword">let</span> args = <span class="variable language_">arguments</span></span><br><span class="line">    <span class="keyword">if</span> (now - pre &gt; delay) &#123;</span><br><span class="line">      fn.<span class="title function_">apply</span>(context, args)</span><br><span class="line">      pre = now</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure><h4 id="3-讨论一下前两种方案的弊端"><a href="#3-讨论一下前两种方案的弊端" class="headerlink" title="3.讨论一下前两种方案的弊端"></a>3.讨论一下前两种方案的弊端</h4><ul><li>假设有两次请求，第一次正常，第二次被节流了</li><li>最后只执行了一次，这是不愿意看到的！</li><li>如何解决？请看第4点</li></ul><h4 id="4-Date结合定时器解决3-的弊端"><a href="#4-Date结合定时器解决3-的弊端" class="headerlink" title="4.Date结合定时器解决3.的弊端"></a>4.Date结合定时器解决3.的弊端</h4><ul><li>在2中代码的基础上来添加</li><li>闭包的timer,如果在节流时间内，就定一个定时器来完成被吃掉的请求</li><li>定时为剩下的时间remainTime&#x3D;delay-(now-pre),定时前记得判断是否存在(存在就不用设置直接return就可以了)，完成后记得要更新pre和timer&#x3D;null</li></ul><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">function</span> <span class="title function_">throttle</span> (fn, delay) &#123;</span><br><span class="line">  <span class="keyword">let</span> pre = <span class="number">0</span></span><br><span class="line">  <span class="keyword">let</span> timer</span><br><span class="line">  <span class="keyword">return</span> <span class="keyword">function</span> (<span class="params"></span>) &#123;</span><br><span class="line">    <span class="keyword">if</span> (!pre) pre = <span class="keyword">new</span> <span class="title class_">Date</span>()</span><br><span class="line">    <span class="keyword">let</span> now = <span class="keyword">new</span> <span class="title class_">Date</span>()</span><br><span class="line">    <span class="keyword">let</span> context = <span class="variable language_">this</span></span><br><span class="line">    <span class="keyword">let</span> args = <span class="variable language_">arguments</span></span><br><span class="line">    <span class="keyword">let</span> remainTime = delay - (now - pre)</span><br><span class="line">    <span class="keyword">if</span> (now - pre &gt; delay) &#123;</span><br><span class="line">      fn.<span class="title function_">apply</span>(context, args)</span><br><span class="line">      pre = now</span><br><span class="line">    &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">      <span class="keyword">if</span> (timer) <span class="keyword">return</span></span><br><span class="line">      timer = <span class="built_in">setTimeout</span>(<span class="function">() =&gt;</span> &#123;</span><br><span class="line">        fn.<span class="title function_">apply</span>(context, args)</span><br><span class="line">        pre = now</span><br><span class="line">        timer = <span class="literal">null</span></span><br><span class="line">      &#125;, remainTime)</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">本文作者:</span> <span class="post-copyright-info"><a href="https://www.webxc.ml">XC's Blog</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">本文链接:</span> <span class="post-copyright-info"><a href="https://www.webxc.ml/post/3617227046/">https://www.webxc.ml/post/3617227046/</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta">版权声明:</span> <span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来自 <a href="https://www.webxc.ml" target="_blank">XC's Blog</a>！</span></div></div><div class="tag_share"><div class="post-meta__tag-list"><a class="post-meta__tags" 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id="aside-content"><div class="card-widget card-info"><div class="is-center"><div class="avatar-img"><img src="https://npm.elemecdn.com/webxc@1.0.0/logo/logo.jpg" onerror='this.onerror=null,this.src="https://npm.elemecdn.com/webxc@1.0.2/banner/404.gif"' alt="avatar"></div><div class="author-info__name">XC's Blog</div><div class="author-info__description">XC's Blog 记录生活和学习文章</div></div><div class="card-info-data site-data is-center"><a href="/archives/"><div class="headline">文章</div><div class="length-num">74</div></a><a href="/tags/"><div class="headline">标签</div><div class="length-num">22</div></a><a href="/categories/"><div class="headline">分类</div><div class="length-num">22</div></a></div><div class="card-info-social-icons is-center"><a class="social-icon" href="https://tenapi.cn/qqzlk/?qq=2848141597" target="_blank" title="QQ"><i class="iconfont icon-QQ"></i></a><a class="social-icon" href="https://npm.elemecdn.com/webxc@1.0.0/lxfs/wechat.jpg" target="_blank" title="微信"><i 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toc-level-3"><a class="toc-link" href="#%E9%98%B2%E6%8A%96"><span class="toc-number">1.1.</span> <span class="toc-text">防抖</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E7%94%9F%E6%B4%BB%E4%B8%AD%E9%98%B2%E6%8A%96%E7%9A%84%E4%BE%8B%E5%AD%90"><span class="toc-number">1.2.</span> <span class="toc-text">生活中防抖的例子</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E7%B1%BB%E6%AF%94%E6%8A%80%E8%83%BD%E5%90%9F%E5%94%B1"><span class="toc-number">1.3.</span> <span class="toc-text">类比技能吟唱</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#js%E4%B8%AD%E7%9A%84%E9%98%B2%E6%8A%96"><span class="toc-number">1.4.</span> <span class="toc-text">js中的防抖</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#1-%E4%BD%BF%E7%94%A8%E9%AB%98%E9%98%B6%E5%87%BD%E6%95%B0%EF%BC%8C%E9%81%BF%E5%85%8D%E6%B7%BB%E5%8A%A0%E5%93%8D%E5%BA%94%E7%9A%84%E6%97%B6%E5%80%99%E8%A7%A6%E5%8F%91%E5%87%BD%E6%95%B0"><span class="toc-number">1.4.1.</span> <span class="toc-text">1.使用高阶函数，避免添加响应的时候触发函数</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#2-%E4%BD%BF%E7%94%A8setTimeout%E5%AE%8C%E6%88%90%E5%BB%B6%E6%97%B6%E6%89%A7%E8%A1%8C-clearTimeout%E6%9D%A5%E6%8E%A7%E5%88%B6%E5%88%B7%E6%96%B0%E5%BB%B6%E6%97%B6"><span class="toc-number">1.4.2.</span> <span class="toc-text">2.使用setTimeout完成延时执行,clearTimeout来控制刷新延时</span></a><ol class="toc-child"><li class="toc-item toc-level-5"><a class="toc-link" href="#2-1-%E4%B8%BA%E4%BB%80%E4%B9%88%E8%A6%81%E6%8A%8Atimer%E5%AE%9A%E4%B9%89%E5%9C%A8%E5%87%BD%E6%95%B0%E5%A4%96%E9%9D%A2%EF%BC%9F"><span class="toc-number">1.4.2.1.</span> <span class="toc-text">2.1 为什么要把timer定义在函数外面？</span></a></li></ol></li><li class="toc-item toc-level-4"><a class="toc-link" href="#3-%E5%B9%B6%E4%B8%8D%E6%98%AF%E4%B8%87%E4%BA%8B%E5%A4%A7%E5%90%89%EF%BC%8C%E6%B3%A8%E6%84%8Fthis%E6%8C%87%E9%92%88%E7%9A%84%E6%94%B9%E5%8F%98"><span class="toc-number">1.4.3.</span> <span class="toc-text">3.并不是万事大吉，注意this指针的改变</span></a><ol class="toc-child"><li class="toc-item toc-level-5"><a class="toc-link" href="#3-1-%E7%94%A8context%E4%BF%9D%E5%AD%98this%E6%8C%87%E9%92%88-args%E4%BF%9D%E5%AD%98%E6%B7%BB%E5%8A%A0%E7%9A%84%E5%8F%82%E6%95%B0-%E7%94%A8apply%E6%9D%A5%E6%94%B9%E5%8F%98this%E6%8C%87%E9%92%88%E7%9A%84%E6%8C%87%E5%90%91"><span class="toc-number">1.4.3.1.</span> <span class="toc-text">3.1 用context保存this指针,args保存添加的参数,用apply来改变this指针的指向</span></a></li></ol></li><li class="toc-item toc-level-4"><a class="toc-link" href="#4-return%E7%9A%84function%E4%B8%8D%E5%8F%AF%E4%BB%A5%E4%BD%BF%E7%94%A8%E5%8C%BF%E5%90%8D%E5%87%BD%E6%95%B0"><span class="toc-number">1.4.4.</span> <span class="toc-text">4.return的function不可以使用匿名函数</span></a></li></ol></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E8%8A%82%E6%B5%81"><span class="toc-number">2.</span> <span class="toc-text">节流</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#%E7%94%9F%E6%B4%BB%E4%B8%AD%E8%8A%82%E6%B5%81%E7%9A%84%E4%BE%8B%E5%AD%90"><span class="toc-number">2.1.</span> <span class="toc-text">生活中节流的例子</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E7%B1%BB%E6%AF%94%E5%B9%B3A%E5%83%B5%E7%9B%B4"><span class="toc-number">2.2.</span> <span class="toc-text">类比平A僵直</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#js%E4%B8%AD%E7%9A%84%E8%8A%82%E6%B5%81"><span class="toc-number">2.3.</span> <span class="toc-text">js中的节流</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#1-%E4%BD%BF%E7%94%A8%E5%AE%9A%E6%97%B6%E5%99%A8%E7%9A%84%E6%80%9D%E6%83%B3%E6%9D%A5%E5%AE%8C%E6%88%90"><span class="toc-number">2.3.1.</span> <span class="toc-text">1.使用定时器的思想来完成</span></a><ol class="toc-child"><li class="toc-item toc-level-5"><a class="toc-link" href="#1-1%E6%A0%B9%E6%8D%AE%E6%80%9D%E8%B7%AF%E5%86%99%E5%87%BA%E5%9F%BA%E7%A1%80%E4%BB%A3%E7%A0%81"><span class="toc-number">2.3.1.1.</span> <span class="toc-text">1.1根据思路写出基础代码</span></a></li></ol></li><li class="toc-item toc-level-4"><a class="toc-link" href="#2-%E4%BD%BF%E7%94%A8Date%E5%AF%B9%E8%B1%A1%E6%9D%A5%E5%AE%9E%E7%8E%B0"><span class="toc-number">2.3.2.</span> <span class="toc-text">2.使用Date对象来实现</span></a><ol class="toc-child"><li class="toc-item toc-level-5"><a class="toc-link" href="#2-1%E7%BB%BC%E5%90%88%E5%89%8D%E9%9D%A2%E7%9A%84%E9%97%AE%E9%A2%98%EF%BC%8C%E7%9B%B4%E6%8E%A5%E5%86%99%E5%87%BA%E6%9D%A5"><span class="toc-number">2.3.2.1.</span> <span class="toc-text">2.1综合前面的问题，直接写出来</span></a></li></ol></li><li class="toc-item toc-level-4"><a class="toc-link" href="#3-%E8%AE%A8%E8%AE%BA%E4%B8%80%E4%B8%8B%E5%89%8D%E4%B8%A4%E7%A7%8D%E6%96%B9%E6%A1%88%E7%9A%84%E5%BC%8A%E7%AB%AF"><span class="toc-number">2.3.3.</span> <span class="toc-text">3.讨论一下前两种方案的弊端</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#4-Date%E7%BB%93%E5%90%88%E5%AE%9A%E6%97%B6%E5%99%A8%E8%A7%A3%E5%86%B33-%E7%9A%84%E5%BC%8A%E7%AB%AF"><span class="toc-number">2.3.4.</span> <span class="toc-text">4.Date结合定时器解决3.的弊端</span></a></li></ol></li></ol></li></ol></div></div><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item"><a class="thumbnail" href="/post/us87/" title="JS进阶第二天"><img src="https://npm.elemecdn.com/webxc/cover/js1.webp" onerror='this.onerror=null,this.src="https://npm.elemecdn.com/webxc@1.0.2/banner/404.gif"' alt="JS进阶第二天"></a><div class="content"><a class="title" href="/post/us87/" title="JS进阶第二天">JS进阶第二天</a><time 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